Biodiversity Quiz Review

How does a decrease in biodiversity impact an ecosystem?

A decrease in biodiversity causes a decrease in ecosystem stability, because a change to one organism will have a greater impact on the entire ecosystem. With greater biodiversity, the loss of one type of organism could be moderated by the adaptation of other organisms to fill its role. This is less likely in an ecosystem with less biodiversity.

When might an increase in biodiversity lead to a decrease in the stability of an ecosystem?

An increase in biodiversity usually leads to an increased stability, but in the case of an invasive species it would lead to a decreased stability.

Adding an organism to a food chain does not affect the other members of the food chain, but removing an organism does. True or False

False

Explain how microevolution and migration can affect an ecosystem.

Migration can negatively impact an ecosystem if the migration is permanent and leads to the loss of native species. Temporary migration, such as in the case of birds flying south in the winter, can maintain the biodiversity of an ecosystem. Microevolution, like migration, can aid the survival of native species.

What happens when an organism is removed from a food chain?

Removing an organism from a food chain causes the populations of the other organisms in the food chain to change as well. They will increase or

Variation of ecological habitats within a species is characteristic of which type of diversity? a.) Genetic diversity b.) Ecosystem diversity c.) Species diversity d.) Regional diversity

The answer is "B", Ecosystem diversity.

The variety of organisms within an ecosystem is charachteristic of which type of diversity? a.) Genetic diversity b.) Ecosystem diversity c.) Species diversity d.) Regional diversity

The answer is "C", Species diversity.

What are the possible consequences of adding an organism to a food chain?

The organism that is added will compete for food resources with an existing organism. This could possibly lead to competitive exclusion.

What happens to the other organisms in a food chain when an organism in the middle of the food chain is lost?

The organisms below it will increase in number, while the organisms above it will decrease in number.

The loss of an organism at the bottom of a food chain negatively impacts all organisms in the chain. True or False

True